Motive device and lock therefor



Apnl 5, 1932. P. R. FORMAN MOTIVE DEVICE AND LOCK THEREFOR Filed Nov. 8. 1929 2 Sheets-Sheet 1 I 314cm oz 5/ /15 Rffmnn. r *M- Patented Apr. 5, 1932 UNITED STATES PATENT OFFICE PARIS 3. FOBIAN, OI BAHWAY, NEW JERSEY, ASSIGNOR TO NATIONAL PNEUMATIC COMPAN Y, OF NEW YORK, N. Y A CORPORATION 01' WEST VIRGINIA HOTIVE DEVICE AND LOCK THEREFOR Application filed November 8, 1829. Serial Io. 405,688.

This invention relates to the combination of a fluid pressure operated device of the vac uum type and a lock therefor for preventing movement of the engine and apparatus connected thereto when an outside force is applied thereto.

One of the objects of this invention is to provide means for locking a fluid pressure operated vacuum engine against movement when an outside force is applied to the device operated by the engine.

Another object of this invention is to provide in such a combination a lock of such construction that it will be operated to free the device upon initial energization thereof.

A still further object of this invention is the provision of a lock structure in connection with a vacuum engine having an exposed piston which lock cooperates with the piston to 90 prevent unlocking of the lock except when the piston begins itsinitial movement under energization.

A still further object of this invention is the provision with such an engine of a latch member of a lock cooperating with means on the connecting rod-so that the latch may be moved upon initial energization and movement of the engine out of locking position.

These and other objects as will appear from .3 the following disclosure are secured by means of this invention.

This invention-resides substantially in the combination, construction, arrangement and relative location of parts all as will be described in greater detail hereinafter.

Referring to the drawings,

Figure 1 is a longitudinal cross-sectional view through the device of this invention showing the parts in one extreme position.

Fig. 2 is an enlarged elevational detailed view showing the lock mounted on the engine cylinder;

Fig. 3 is a'viciw similar to Fig. 1 with the parts in the very extreme position and the loclr inlocking position; and

Fig. 4 is a cross-sectional view on the line 4-4 of Fig. 3.

This invention is directed in general to a combination of a fluid pressure engine of the vacuum type having an exposed piston. In-

this combination the lock cooperates with the end of the piston so that the latch member cannot be operated except upon energization of the engine to cause its initial movement. The lock is so constructed that the latch memher can be raised manually to'a position where it can-be moved out of locking position if this be desired.

The invention will be more clearly understood by reference to the drawin The engine isfshown comprising a cylinder 1 having a closure cap 2 at one end with a threaded passage 3 to receive a connection to any vac uum source such as a vacuum pump or the intake manifold of an internal combustion engine. The other end of cylinder 1 is closed by a cap 4 which also has a threaded passage 5 leading into the cylinder. The connections for an engine of this type are clearly shown in my copending application Serial No.

372,830 filed June 22, 1929, issued as Patent No. 1,832,618 on Nov. 17, 1931. Slidably mounted within cylinder 1 is a piston 6 which has an open ended hollow piston rod 7 connected thereto. The open end of the hollow piston rod is closed by a plug 8 within which is slidably mounted a small plunger 9 between which and the end of the hollow piston rod is a coiled spring 10.

Secured within a suitable opening in. cap

4 is a smaller cylinder 11 within which operates a smaller piston 12. This piston isconnected to a reduced part of the piston rod 7 which has a small extension 13. The cylinder 11 is open at its free end to atmospheric pressure. Piston 12 is provided with a projection cvlindrical portion 26. A forked member 14 is pivotally connected to the projection 13 and is .provided with a reduced cylindrical extension 15 on the end of which is secured a small piston 16. A thimble like member adapted to be connected to a suitable connecting link to the device to be operated is shown at 18 with a cylindrical recess formed therein which is closed by a plug 17 having a central bore in which the extension 15 slides. The piston 16 operates within the cylindrical recess in the member 18 which recess is long enough to permit relative movement of the elements 14, 17 and 16 as a unit. Ice

A bracket 19 projects from the end of cylinder 11 and has formed in its two sides the slots 23. A pin 21 on which the latch member 22 is pivotally supported is secured in these slots 23. A U-shaped strap 20 fits over the ends of the pin 21 as shown in Fig. 2. The latch 22 is provided with a projection 24 which is normally in the path of the pro jection 27 on the member 18. The latch 22 also has a projection 25 which overlaps the cylindrical portion 26 of piston 12 when the piston is in the position shown in Figure 3. As is shown in Figure 1 the entire coupling unit comprising the elements 14, 15, 16, 17 w and 18 is pivotally connected to the extension 13 of the piston. I Assuming that the engine is connected to adoor to be operated by means of a link between a door and the member 18 it is apparent that if pressure is applied to the door to force it to open projection 27 will strike projection 24 ,on the latch 22. The latch will tend to rotate in a clockwise direction but its projection 25 will strike the cylindrical pro- 25 jection 26 of piston 12. As is apparent when the door is closed piston 12 is in the position shown in Figure 3. As a result the door cannot be opened because the latch 22 strikes the piston. When the engine is energized to operate it to the left so that piston 12 moves upwards to the left piston 16, rod 15 and its fork 14 can move to the left with it. The parts are so proportioned that by the time piston 16 has moved to the point where it con- 5 tacts with plug 17 piston 12 will have withdrawn sufiiciently so that its projection 26 is out of the path of the projection 25 on latch 22. As a result member 18 which now begins to move can continue to move so that 40 when its projection 27 strikes projection 24 on the latch the latch can rotate in a clockwise direction permitting the member 18 to move on to the left with the piston 12. When the engine operates in the reverse direction to the 'point where projection 27 strikes projection 24 their inclined surfaces will rotate to. force the latch 22 and its supporting pin 21 upwardly in the slots 23 so that projection 24. If it is desired at any time to manually release the lock it is only necessary to grasp the strap 20 and raise it upwardly carrying with it the latch 22 and its pin 21. The door may then be opened by hand.

It will be apparent from the foregoing disclosure that I have devised a novel form of combination engine and locking means in accordance with certain principles of construction and operation. I am, of course, aware that these principles can be embodied in other physical formswithout departing from the scope of this invention and I do not, therefore, wish to be limited to the disclosure which is given in an illustrative sense ber out of the path of movement of the 27 can move to the right beyond projection but rather to the scope of the appended claims.

What I seek to secure by United States Letters Patent is:

1. In a combinationof the type described, a vacuum engine having an open ended eyl inder, apiston operating in said cylinder, a latch member pivotally supported on said cylinder, a two-part connecting member connected to said piston, and means on one of said parts for engaging said latch member upon movement thereof said latch memberbeing arranged to strike said piston when in its normal position to prevent movement of the connecting member and piston by applying force thereto.

2. In a combination of the type described, a movable piston, a latch member pivotally supported to strike said piston in one extreme of its position, a connecting link attached to said piston, and means thereon for striking said latch member upon movement of the connecting link by applying force thereto said connecting link causing said latch to strike said piston.

3. In the combination of .the type described, a movable piston, a latch pivotally supported adjacent thereto so as to strike it in one of its positions, a two-part connecting member attached to said piston, said parts being relatively movable, and means on one of said parts for striking said latch member when force is applied thereto to cause the latch member to jam against the piston.

4. In the combination of the type described, a movable piston, a latch pivotally supported adjacent thereto so as to strike it in one of its positions, a two-part connecting memberiattached to said piston, said parts being relatively movable, means on one of said parts for striking said latch member when force is applied thereto to cause the latch member to jam against the piston, and means for manually raising the latch memmeans on one of the parts of the connecting member.

5. In a combination of the type described, a movable piston, a latch member, slotted means for pivotally supporting the latch member on a pin which is mounted in the slots, a relatively movable two-part connecting link attached .to said piston, means on one of said parts for striking said latch member when, a force is applied thereto to cause it to jam against said piston, and manual means for raising said pin and latch member out of normal position to permit movement of the connecting link and piston by a force applied thereto. 195 6. In the combination of the type described. a movable piston, a latch pivotally supported adjacent thereto so as to strike it in one of its positions, a two-part connecting member attached to said piston, said parts loeing relatively movable, and means on one of saicl parts for striking. said latch memher when force is applied thereto to cause the latch member to jam against the piston, said piston moving out of engagin with the latch when operated by 1nd ressure and said relativelymovable parts 0 the connecting link elfectlng relative movement to allow the wing the latch.

In testimony whereof I have hereunto set my hancl on this 6th day of N ovember, A. D.

PARIS R. FORMAN.

position piston to move without jam- 

